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Treatment of o-alkynylphenylsydnones with triflic acid or trifluoroacetic acid provides a novel avenue to 3-arylcinnolines. With triflic acid the best results were obtained at room temperature with alkynylsydnones containing an electron-withdrawing group (or an H) whereas with TFA an electron-donating group and reflux conditions were required.

Treatment of o-alkynylphenylsydnones with acids: a new route to 3-arylcinnolines